Securing each door of a pair of standard doors is accomplished using several different methods. The most common method is to use a concealed or surface vertical rod exit device on each of the doors. This way, a vertical rod exit device secures each door individually. When one door is opened, the...
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Securing each door of a pair of standard doors is accomplished using several different methods. The most common method is to use a concealed or surface vertical rod exit device on each of the doors. This way, a vertical rod exit device secures each door individually. When one door is opened, the other door remains secured. The overall appearance is the same for both doors.
For many installations, especially expensive wood door entries, the use of a cylindrical or mortise lock is more appealing. But how do you control the doors from swinging open? A mortise and cylindrical lock is not designed to secure the door closed in a double-door application. The solution: equip the door without the lock with a flush bolt, which is a mechanism that secures the door when closed. In this scenario, the lock-equipped door becomes the active door and the door without the lockset becomes the inactive door. The inactive door is secured, keeping both doors from swinging open when closed. The inactive door also limits the traffic flow by remaining closed when the active door is opened. The inactive door can not be opened without first opening the active door.
To control an inactive door, flush bolts are mounted into the top and sometimes the bottom corners of its swing edge. Flush bolts have a bolt that extends either manually or automatically into the header and sometimes the threshold to secure the door when closed. Manual flush bolts require a toggle to move up or down to extend or retract the bolt.
Automatic flush bolts are designed to secure the inactive door on a pair of doors when both doors are closed. As the active door closes, the door edge pushes in the trigger on the automatic flush bolts mounted into the inactive door. Pushing in the trigger causes the vertical bolt to extend from the door top and bottom into the strike opening in the header and the threshold, securing the inactive door in the closed position. Once the active door has been opened, the bolts retract and the inactive door can be opened.
NOTE: When installing automatic flush bolts, install a door coordinator to ensure that when both doors are opened, the inactive door closes first. Then the active door will activate the automatic flush bolts, securing the inactive door.
Major Manufacturing is introducing the HIT-42FB8, an anodized aluminum jig, which prepares wood doors for installation of Ives automatic flush bolts. These flush bolts require two cutouts, one for the guide and faceplate and one for the bolt mechanism. The bolt mechanism is approximately 7 inches long, 2 inches wide, and 1 inch thick.
To accommodate the two different sized cutouts, the HIT-42FB8 jig has a removable template. With the template removed, the opening is created for the guide and face plate. Then with the template attached, the mortise is cut for the housing of the bolt mechanism. The template is secured to the jig using Phillips head screws.
Ives automatic flush bolts can be installed individually or in pairs, one top and one bottom in the inactive door of a pair of doors. The door prep is the same for both. The difference between top and bottom flush bolts is the position of the trigger. Note: When installing the Ives automatic flush bolts, the recommended clearance between the active and inactive door is 1/8". The maximum undercut for the inactive door is 3/4".
The Major Manufacturing HIT-42FB8 is designed to accommodate 1-3/4", 2" and 2-1/4" thick doors. This installation jig is designed to operate with a router using 1/2" diameter cutter and a 5/8" diameter template guide. Major Manufacturing has determined that the best cutter for this jig is a two flute upshear cutter.
Major Manufacturing recommends using at least a 10-amp, plunge-style router to prepare a wood door for the Ives automatic flush bolts. For this installation, we used a Porter Cable Model 691 with the available plunge router base, part number 6931.
IMPORTANT: When operating a power tool, always wear eye, face, and ear protection. Always follow the manufacturer's instructions and cautionary notes.
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Doors can be equipped with push / pull hardware, door viewers, sweeps, plates, flush bolts, center pivots, offset pivots, butt hinges, concealed over-head hinges, floor closers, or over-head surface...
By Gale Johnson and Jerry Levine